Charging base



FIG. 1 is a perspective view of the charging base;

FIG. 2 is a top plan view of the charging base;

FIG. 3 is a bottom plan view of the charging base;

FIG. 4 is a left elevation view of the charging base;

FIG. 5 is a front elevation view of the charging base;

FIG. 6 is a back elevation view of the charging base;

FIG. 7 is another perspective view of the charging base; and,

FIG. 8 is another perspective view of the charging base.

Broken lines and unshaded portions contained within broken lines depict exemplary elements of the charging base that are shown for illustrative purposes only and that form no part of the claimed design. 

CLAIM The ornamental design for a charging base, as shown and described. 